Abstract:To deal with low machining efficiency and short-circuits caused by the instability of the inter-electrode gap size in pulse electrochemical narrow slot machining, a segmented cathode feeding control method to be self-adaptive with the dissolution rate of work piece is proposed in this paper. A theoretical model between inter-electrode current and feeding depth is constructed and adjusted by experimental data to be accordant to real machining process. According to the relationship

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... n current and feeding depth, a correction equation for feeding velocity is formulated, and cathode feeding process is divided into multiple stages with different feedrates. To make velocity smooth link between two neighbor stages and avoid inter-electrode current surge, a velocity blending algorithm is proposed and velocity control equation is constructed. Experimental results show that the segmented feeding control algorithm can avoid short-circuits, improve machining efficiency and achieve contour accuracy of industrial application in small gap pulse electrochemical machining.